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Brush Seals

In addition to conventional labyrinth sealing technologies, Waukesha Bearings provides compliant brush sealing systems that can be applied to a wide variety of rotating equipment.

Typically used in air, steam, or process gas applications, Waukesha Bearings brush seal product offerings reduce the “leakage gap” between the sealing surface and rotor. The compliancy of a brush seal allows the bristles to deflect with minimal wear, thereby maintaining a small “leakage gap” over time and increasing operational efficiencies. Brush seals have been shown to reduce labyrinth leakage by up to 80%.

Waukesha Bearings brush seal technology was originally used in the aerospace industry, where it has accumulated millions of successful operating hours since the first installation in the 1980s in efforts to improve jet engine efficiency and reduce airborne pollutants.

Our experience has taken the technology beyond aerospace into the harsh and demanding environments of industrial turbomachinery. With more than 1,600 units in operation, Waukesha Bearings brush seals are used in a wide variety of applications, including land-based gas turbines, process steam turbines, utility steam turbines, centrifugal compressors, and turboexpanders.

Our brush seal offering can be divided into three primary areas of application:

 

Our patented brush seal, US Patent 6,231,047, was originally developed for and continues to serve aerospace applications. The uniqueness of our product rests with its flexible sizing and replaceable bristle pack. These two features alone are technology differentiators and provide the benefits of quick turn times, ease of installation, and seal repair. These benefits coupled with efficiency gains provide valuable savings in solving your critical sealing needs.
 

Configurations:

  • Solid ring
  • Split ring
  • Segmented
  • Cartridge
  • Linear strip
     

Sizes (Diameter):

  • For strip: 152 mm (6") and up
  • For ring: 19 mm (0.75") to 229 mm (9")
     

Materials of Construction:

  • Housing: Stainless steel, Inconel, others
  • Bristles: Haynes 25
  • Pressure: Up to 300 psid (20 bar) per brush seal stage
  • Temperature: Up to 650°C (1,200°F)
  • Surface speed: Up to 335 m/s (1,100 ft/sec)
  • Environments: Gas path (air, steam); bearing (air/oil)